Commit all the non-functional changes to python ports to reduce the diff size
for an exp-run of updated python versions.
- trim Makefile headers
- remove leading indefinite article from COMMENT
- use PYTHON shortcut in MASTER_SITES
- whitespace fixes
- remove checks for unsupported versions of FreeBSD
- use static value ``33'' instead of PYTHON_SUFFIX in lang/python33/pkg-plist,
because this value is not supposed to be changed across the branch and for
consistency with other python3 ports
- remove conflicts in lang/python-mode.el with not more existing python-2.4